ABSTRACT
The target of the recent study is to achieve a significant inexpensive and eco-friendly way for getting ZTA/HA composites, based on the nano-HA derived from the eggshell biogenic source. Combining simultaneously the porous structure; which is considered as a bone formation key, with developed mechanical properties and adequate biocompatibility, is another purpose of this study. Furthermore, the impact of ZTA addition from 10-30 mass-%, fabricated by uniaxial pressing and sintering at 1200-1300 °C for 2 h, on the physical and mechanical properties, microstructure and phase composition of ZTA/HA composite bodies was investigated. The results demonstrated that the increasing of ZTA content increases the bodies' apparent porosity and decreases the bulk density due to the decomposition of HA into ß-TCP. Where the formation of ß-TCP possessed the predominant impact on the mechanical properties of the sintered ZTA/HA composites. ICP, SEM, EDX and thin film XRD results of composites containing 20 mass-% ZTA affirmed the excellent bioactivity of the bodies.
Subject(s)
Aluminum Oxide/chemistry , Biocompatible Materials/chemical synthesis , Durapatite/chemistry , Zirconium/chemistry , Absorbable Implants , Aluminum Oxide/pharmacology , Animals , Biocompatible Materials/chemistry , Biocompatible Materials/pharmacology , Bone Substitutes/chemistry , Calcium Phosphates/chemistry , Chickens , Egg Shell/chemistry , Materials Testing , Osteogenesis , Porosity , Surface Properties , Zirconium/pharmacologyABSTRACT
Background: Hyperpneumatisation of the skull base and upper cervical vertebrae is a very rare condition of uncertain aetiology and pathophysiology. Case report: A case of extensive hyperpneumatisation of the craniocervical junction and upper three cervical vertebrae is described, in a patient who habitually performed the Valsalva manoeuvre to relieve the symptoms of a patulous eustachian tube. Reported symptoms of ear, neck and shoulder pain deteriorated after minor head trauma. There was a drastic radiological and clinical improvement after ceasing to perform the Valsalva manoeuvre. Discussion: All reported cases of craniocervical bone hyperpneumatisation have in common a history of raised middle-ear pressure, minor trauma or both. We therefore suggest that chronically raised middle-ear pressure leads to destruction of bony tissue and pneumatisation, and that this process is able to cross joints into the cervical spine, either via micro-fractures following trauma, or as a result of congenital assimilation of the craniocervical junction.
ABSTRACT
Two different techniques for mastectomy were carried out on 14 goats with gangrenous mastitis. The animals were randomly assigned to one of two groups containing seven goats each. The first group was operated via a classical surgical mastectomy technique (either bilateral (n=5) or unilateral (n=2)). The second group was operated via vascular ligation of the external pudendal blood vessels and milk vein and amputation of the affected teat (either bilateral (n=3) or unilateral (n=4)). Comparison between the two groups was carried out. Vascular ligation and teat amputation proved to be an effective, quick, safe, and less expensive technique for mastectomy in goats. Ligation of udder vasculature was less traumatic than surgical amputation and the stress on the patient was minimal.
ABSTRACT
Two anasarcous foetuses of Awassi sheep are described. The foetuses were removed from the dams by caesarean section because of dystocia due to failure of cervical dilation. Uterine incision was made in situ because uteri were so distended they could not be brought out from the site of incision. Large quantities of uterine fluids and abnormal thick placentas were found. One foetus weighed about 7 kg and the other 13 kg. The foetal heads were deformed: the upper jaw was prognathic and the left ear of the small foetus was cystic. Necropsy revealed subcutaneous musculature was soft and flabby and abdominal and thoracic cavities contained serosanguinous fluid. Histopathological examination revealed that only the larger foetus had focal aggregates of basophilic nucleated red blood cells and scattered megakaryocytes in the liver. We conclude that anasarca can occur in Awassi sheep, with and without associated extramedullary haematopoiesis.
